Bug 459190

SUMMARY
Many games give you the option to choose which display the game should output on, typically exclusively for fullscreen. This is... touchy at best for games, including on Windows and macOS, but games that I own which I previously was able to use this option correctly with in Plasma 5.25 do not work with the 5.26 Beta.

Yakuza 0 is the game I tested with. It will allow me to change and apply the setting say from Display 3 to Display 2 , but it won't actually change displays like it does on I believe 5.25. Going back out and into the game's settings again shows the setting back to Display 3.

Of course there are various other situations where this could happen, games just display this more clearly.


STEPS TO REPRODUCE
1. Open an application that allows you to change the fullscreen output display such as a game.
2. Attempt to change the output display
3. Nothing happens.

OBSERVED RESULT
X11 Games (and likely other applications with similar functionality) do not change output displays when their option is selected. 


EXPECTED RESULT
X11 Games should change their output display when the option is selected, if it worked previously for that game/application in 5.25.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.19.8-zen1-1-zen (64bit)
KDE Plasma Version: 5.25.90
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6

ADDITIONAL INFORMATION
Games can still be changed by using the Window menu and changing the output display.

This problem is very, very minor and seems to be a small feature regression which needs to be fixed upstream rather than on the Plasma side. Thought I'd report it here to be safe though as I'm currently testing the 5.26 beta :-)